<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    .banner{
        width: 500px;
        height: 600px;
        background-color: goldenrod;
    }
    .son{
        width: 200px;
        height: 300px;
        background-color: red;
        position: absolute;
        left: 30px;
    }
    .kk{
        width: 300px;
        height: 20px;
        background-color: rebeccapurple;
    }
</style>
<body>

<div class="banner">
    <div class="son"></div>
    <div class="kk"></div>
</div>
</body>
</html>